PDF malware analysis — malicious · 1fd474248b4b0503

MALICIOUS

PDF

4.3 KB

MD5: 1d4dcef0ea598b527255aa5117c5b46d SHA-1: 0a79588bc7f30288e06679e2425acc585dabbbf6 SHA-256: 1fd474248b4b050374c51345c53e2bb6b2bbd0913aba9af462e0a744f4176428

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscation. The critical CVE-2008_2992 heuristic confirms the exploitation of a PDF vulnerability via JavaScript. The extracted JavaScript files, particularly 'numeric_charcode_stage_000.js', are likely responsible for downloading and executing a secondary payload. The exact nature of the payload cannot be determined from the provided evidence.

Heuristics 6

util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `7622a7f2d351ef948f06e68e3abc58c9d97c8036e92ed592616401ba8c068ba4`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	22337 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `12f7232a95d44c1050912e5347b5a9fdc856f3f1b30086ea230131c6c616b547`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6578 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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